verb
signify
SIG-nih-fye/ˈsɪɡnɪfaɪ/
To mean or be a sign of something.
The raised palm signifies that the approaching people should wait at the doorway.

Etymology
“Sign” and “make” combine in the idea of making something known through signs. To signify therefore means to convey or indicate something, whether through words, actions, or another sign.
In context
The wings underneath the skull of my tattoo signify the freedom I felt when I finally found my voice.
So you just add "ed" to a verb at the end to signify the past.
More examples
- Dark clouds often signify an approaching storm.
- What does this symbol signify on the map?
- Her nod signified agreement with the plan.
Forms
signify · signifies · signified · signifying